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rezolvati ecuatia x+ 2 x+3x+...+100 x=50500

Răspuns :

x(1 + 2 + 3 +.......+100) = 50500     
x·100·101/2 = 500·101
x·50·101 = 500·101 
x = 10
x(1+2..+100)=
x(100x101:2)=
x*5050=50500
x=50500:5050
x=10